US4825707A - Fluid flow indicator including a hall effect transducer - Google Patents

Fluid flow indicator including a hall effect transducer Download PDF

Info

Publication number
US4825707A
US4825707A US06/914,144 US91414486A US4825707A US 4825707 A US4825707 A US 4825707A US 91414486 A US91414486 A US 91414486A US 4825707 A US4825707 A US 4825707A
Authority
US
United States
Prior art keywords
rotor
housing
invention according
passageway
fluid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US06/914,144
Inventor
Lars O. Rosaen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to US06/914,144 priority Critical patent/US4825707A/en
Application granted granted Critical
Publication of US4825707A publication Critical patent/US4825707A/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
    • G01F1/06—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects using rotating vanes with tangential admission
    • G01F1/075—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects using rotating vanes with tangential admission with magnetic or electromagnetic coupling to the indicating device
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F7/00—Volume-flow measuring devices with two or more measuring ranges; Compound meters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S73/00—Measuring and testing
    • Y10S73/03—Hall effect

Definitions

  • the present invention relates to fluid flow monitors, and more particularly, to a fluid flow rate indicating assembly.
  • Fluid flow rate indicating assemblies have long been known.
  • a member responsive to fluid flow is disposed in a housing through which the fluid passes. Flowing fluid impinges on the member, causing it to move.
  • the member is resiliently biased against such motion, so that movement of the member is indicative of the rate of fluid flow.
  • Biasing means commonly employed include gravity or springs.
  • the member can be a rotor, which is mounted on an axle having an end which passes through the housing, and which is connected to a tachometer. The rate of rotation of the rotor, as measured by the tachometer, corresponds to the rate of fluid flow through the housing.
  • the type of indicator including a resiliently biased member also usually includes a shaft or other member passing through the housing, whose position can be correlated to the flow rate.
  • the present invention overcomes these and other drawbacks by providing a fluid flow indicator having a housing which, except for a detachable cover, is imperforate.
  • the housing includes a housing portion defining a fluid passageway therethrough.
  • a vaned rotor is contained in the housing in a position so as to be rotated by the impingement of fluid flowing through the passageway on the vanes of the rotor.
  • a Hall effect transducer is positioned outside the housing. The material of the rotor and the construction of the transducer are selected so that the Hall effect transducer is responsive to the rotation of the rotor, and produces an output signal corresponding to a condition of fluid flow through the passageway.
  • the transducer produces a voltage output corresponding to the rotational rate of the rotor, and thus to the linear flow of fluid through the passageway.
  • the indicator comprises a plurality of rotors, only one of the rotors being disposed in the housing at one time, and each of the rotors having hydraulic characteristics distinct from the other rotors. Replacement of one rotor with another thus serves to change the range of flow rates over which the indicator is useful.
  • the rotor comprises a paddle wheel carried on an axle whose ends are trapped in recesses in the fluid passageway and the housing cover.
  • the axis of the paddle wheel is offset from the axis of the flow passageway, but in projection is disposed perpendicularly to it.
  • the paddle wheel is partly disposed in a cylindrical recess in the housing, so that only one axial end of the paddle wheel is disposed in the fluid passageway.
  • the radial length of each of the paddles is on the close order of the diameter of the fluid passageway.
  • the axis of the paddle wheel is thus preferably disposed outside the radial extent of the fluid passageway.
  • a pair of magnets are carried on or preferably in opposing paddles to induce an output signal from the transducer.
  • FIG. 1 is a perspective view of the preferred embodiment of the present invention
  • FIG. 2 is a side view of the preferred embodiment of the present invention, with parts removed for clarity;
  • FIG. 3 is a partial cross-sectional view taken along line 3--3 of FIG. 2.
  • a fluid flow indicator 10 first comprises a fluid housing 12 having a housing portion or conduit 14 defining a fluid passageway 16 therein.
  • the housing portion 14 is externally threaded for connection to a fluid flow system in a conventional manner.
  • a vaned rotor 18, preferably a paddle wheel 20, is disposed in a cylindrical recess 19 in the housing 12, in a position such that fluid flowing through the passageway 16 impinges on the rotor 18.
  • the paddle wheel 20 is rotatably carried on an axle 22.
  • the axis on which the axle 22 turns is perpendicular but skewed to the axis of the fluid passageway 16, and preferably is positioned outside a tangential extension of the passageway 16. In this manner, fluid directly impinges on the rotor 18 on only one side of the axle 22.
  • the housing 12 includes an imperforate cover 24, and the axle 22 is trapped between the cover 24 and a part 27 of the housing portion 14 opposite the cover 24.
  • the axial ends of the axle 22 are insertably received in recesses in the housing portion 14 and the cover 24.
  • the cover 24 is threadably engaged with the housing 12 and is provided with a plurality of flanges 26 for tightening the cover 24 by hand or by other means.
  • a seal (not shown) can be disposed between the cover 24 and the remainder of the housing 12 to aid the prevention of leakage of fluid from the housing 12.
  • a Hall effect detector 30 is detachably affixed to the outside of the housing 12 by a pair of clips 32. While the particular construction of Hall effect transducers is well known and not specifically the subject of the present invention, the construction of the transducer 30 and the rotor 18 are selected such that the Hall effect transducer is responsive to the rotation of the rotor 18 so as to produce an output signal corresponding to a condition of fluid flow through the passageway 16, preferably corresponding to the rate of rotation of the rotor 18 and thus the volumetric flow of fluid through the passageway 16.
  • the transducer includes a plurality of leads 35 for the supply of current to the detector and the output of a signal to appropriate means (not shown) for converting the signal to a numerical flow rate. It is well known that the Hall effect is the development of a potential difference across a current-carrying conductor when the conductor is introduced into a magnetic field. The potential difference is developed at right angles to both the current flow and to the magnetic field.
  • the transducer 30 and the rotor 18 are useful in the present invention.
  • the rotor 18 is constructed from a magnetic material
  • the transducer 30 includes a current-carrying conductor disposed outside the housing 12, such that the passage of the magnetic rotor vanes near the transducer changes the magnetic field experienced by the conductor, creating the output signal corresponding to a condition of fluid flow.
  • the transducer 30 can include both a current carrying conductor and a magnet, while the rotor 18 is constructed from a ferrous material.
  • Both the magnet and conductor of the transducer 30 are disposed closely adjacent the housing 12, such that the rotation of the rotor causes the rotor vanes to pass near the magnet and conductor and vary the magnetic field experienced by the conductor, resulting in the development of the output signal.
  • the material from which the housing 12 is constructed should be selected so as not to interfere with the interaction of the rotor 18 and the transducer 30.
  • the housing 12 should not act as a shield between the rotor 18 and the housing 12.
  • the paddle wheel 20 includes a plurality of rectangular paddles 28 which are planar and radially equiangularly disposed about the axis of rotation of the rotor 18.
  • the paddles 28 are each coplanar with the axis of rotation of the rotor 18.
  • the paddle wheel 20 is constructed from a plastic or resin which is substantially inert to the fluid passing through the housing 12.
  • the paddle wheel 20 comprises twelve symmetrically disposed paddles 28 although it should be apparent that more or fewer paddles would also work as well.
  • An elongated and rectangular recess 33 is formed in one end 38 of each of an opposing pair 34 of the paddles 28.
  • the recesses 33 extend about halfway through the pair of paddles 34, and each frictionally retains a permanent magnet 36 at an inner recess end 40.
  • the magnets 36 are also preferably inert to the fluid passing through the housing 12, although the magnets 36 can alternatively be sealed and retained on the recesses 33 by an inert material.
  • the magnets 36 are preferably oriented so as to maximize the magnetic field changes experienced by the Hall effect transducer 30, and are inserted into the recesses 33 a sufficient distance so that, when rotated, the paths of the magnets 36 are tangential to the center of the transducer 30.
  • the present invention includes a plurality of replaceable rotors 18 having different rotational efficiencies, such that they rotate with different speeds at the same rate of fluid flow.
  • the substitution of one rotor for another in the housing 12 thereby changes the rate at which the magnetic field experienced by the conductor in the transducer 30 changes, thereby changing the range of fluid flow rates which can be measured by an apparatus 10.
  • the present invention is thus advantageous over the prior art indicators in several ways.
  • the housing is imperforate to mechanical connection or linkage between the transducer and the rotor.
  • the only sources of leakage during normal operation are the cover and the connections to the remainder of the fluid system, and these can generally be sealed to withstand significantly higher pressures than traditional shaft packings, so the leakage encountered in the earlier indicators is avoided.
  • the simple construction allows a rapid change of the flow rate range of the indicator, without requiring extensive repacking about the shaft which traditionally perforates the housing.
  • the range of flow rates over which the detector is operational can also be changed by changing the transducer employed. Changing the rotor, however, is substantially quicker and free of trouble than is changing the transducer, since no electrical connections need to be broken or made.

Abstract

An indicator for the rate of volumetric fluid flow includes a housing having a fluid passageway therein and a rotor contained in the housing in a position so as to be rotated by fluid flowing through said passageway. The indicator also includes a Hall effect transducer positioned outside the housing, responsive to the rotation of the rotor. The transducer produces an output signal corresponding to the rate of rotation of the rotor, and thus to the rate of fluid flow through the housing passageway. Preferably, the rotor is a paddle wheel disposed on an axle in the housing. The axle and thus the paddle wheel are retained in the housing by entrapment against a removable housing cover. The housing is otherwise mechanically imperforate to any connection between the rotor and the transducer. The indicator can preferably include a plurality of rotors having different hydraulic characteristics, that is, which rotate at different speeds for a given rate of fluid flow, such that replacement of one rotor for another changes the range of fluid flow rates over which the indicator is responsive.

Description

BACKGROUND OF THE INVENTION
I. Field of the Invention
The present invention relates to fluid flow monitors, and more particularly, to a fluid flow rate indicating assembly.
II. Description of the Prior Art
Fluid flow rate indicating assemblies have long been known. Typically, a member responsive to fluid flow is disposed in a housing through which the fluid passes. Flowing fluid impinges on the member, causing it to move. Often, the member is resiliently biased against such motion, so that movement of the member is indicative of the rate of fluid flow. Biasing means commonly employed include gravity or springs. Alternatively, the member can be a rotor, which is mounted on an axle having an end which passes through the housing, and which is connected to a tachometer. The rate of rotation of the rotor, as measured by the tachometer, corresponds to the rate of fluid flow through the housing. The type of indicator including a resiliently biased member also usually includes a shaft or other member passing through the housing, whose position can be correlated to the flow rate.
These known types of fluid flow indicators have encountered some drawbacks, however. Most notably, the perforation of the housing for the passage therethrough of a rotor shaft or other indicating shaft permits fluid leakage between the bore and shaft. This is usually met by disposing a packing about and between the shaft and housing bore. However, such packing is sometimes messy and occasionally unsuccessful. The packing is subject to wear, while the fluid being measured is subject to contamination from the packing material. The cost and difficulty of constructing packing structures which are resistant to high pressures increase as the fluid pressures encountered increase.
SUMMARY OF THE PRESENT INVENTION
The present invention overcomes these and other drawbacks by providing a fluid flow indicator having a housing which, except for a detachable cover, is imperforate. The housing includes a housing portion defining a fluid passageway therethrough. A vaned rotor is contained in the housing in a position so as to be rotated by the impingement of fluid flowing through the passageway on the vanes of the rotor. A Hall effect transducer is positioned outside the housing. The material of the rotor and the construction of the transducer are selected so that the Hall effect transducer is responsive to the rotation of the rotor, and produces an output signal corresponding to a condition of fluid flow through the passageway. Most advantageously, the transducer produces a voltage output corresponding to the rotational rate of the rotor, and thus to the linear flow of fluid through the passageway. Preferably, the indicator comprises a plurality of rotors, only one of the rotors being disposed in the housing at one time, and each of the rotors having hydraulic characteristics distinct from the other rotors. Replacement of one rotor with another thus serves to change the range of flow rates over which the indicator is useful.
In the preferred embodiment of the present invention, the rotor comprises a paddle wheel carried on an axle whose ends are trapped in recesses in the fluid passageway and the housing cover. The axis of the paddle wheel is offset from the axis of the flow passageway, but in projection is disposed perpendicularly to it. Conveniently, the paddle wheel is partly disposed in a cylindrical recess in the housing, so that only one axial end of the paddle wheel is disposed in the fluid passageway. Preferably, the radial length of each of the paddles is on the close order of the diameter of the fluid passageway. The axis of the paddle wheel is thus preferably disposed outside the radial extent of the fluid passageway. A pair of magnets are carried on or preferably in opposing paddles to induce an output signal from the transducer.
BRIEF DESCRIPTION OF THE DRAWING
A better understanding of the present invention will be had upon reference to the following detailed description, when read in conjunction with the accompanying drawing, wherein like reference characters refer to like parts throughout the several views, and in which:
FIG. 1 is a perspective view of the preferred embodiment of the present invention;
FIG. 2 is a side view of the preferred embodiment of the present invention, with parts removed for clarity; and
FIG. 3 is a partial cross-sectional view taken along line 3--3 of FIG. 2.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT OF THE PRESENT INVENTION
With reference now to the Figures, a fluid flow indicator 10 according to the present invention first comprises a fluid housing 12 having a housing portion or conduit 14 defining a fluid passageway 16 therein. The housing portion 14 is externally threaded for connection to a fluid flow system in a conventional manner.
A vaned rotor 18, preferably a paddle wheel 20, is disposed in a cylindrical recess 19 in the housing 12, in a position such that fluid flowing through the passageway 16 impinges on the rotor 18. Preferably, the paddle wheel 20 is rotatably carried on an axle 22. The axis on which the axle 22 turns is perpendicular but skewed to the axis of the fluid passageway 16, and preferably is positioned outside a tangential extension of the passageway 16. In this manner, fluid directly impinges on the rotor 18 on only one side of the axle 22. The housing 12 includes an imperforate cover 24, and the axle 22 is trapped between the cover 24 and a part 27 of the housing portion 14 opposite the cover 24. Preferably, the axial ends of the axle 22 are insertably received in recesses in the housing portion 14 and the cover 24. The cover 24 is threadably engaged with the housing 12 and is provided with a plurality of flanges 26 for tightening the cover 24 by hand or by other means. A seal (not shown) can be disposed between the cover 24 and the remainder of the housing 12 to aid the prevention of leakage of fluid from the housing 12.
A Hall effect detector 30 is detachably affixed to the outside of the housing 12 by a pair of clips 32. While the particular construction of Hall effect transducers is well known and not specifically the subject of the present invention, the construction of the transducer 30 and the rotor 18 are selected such that the Hall effect transducer is responsive to the rotation of the rotor 18 so as to produce an output signal corresponding to a condition of fluid flow through the passageway 16, preferably corresponding to the rate of rotation of the rotor 18 and thus the volumetric flow of fluid through the passageway 16. The transducer includes a plurality of leads 35 for the supply of current to the detector and the output of a signal to appropriate means (not shown) for converting the signal to a numerical flow rate. It is well known that the Hall effect is the development of a potential difference across a current-carrying conductor when the conductor is introduced into a magnetic field. The potential difference is developed at right angles to both the current flow and to the magnetic field.
Several types of construction of the transducer 30 and the rotor 18 are useful in the present invention. In one construction, the rotor 18 is constructed from a magnetic material, and the transducer 30 includes a current-carrying conductor disposed outside the housing 12, such that the passage of the magnetic rotor vanes near the transducer changes the magnetic field experienced by the conductor, creating the output signal corresponding to a condition of fluid flow. Alternatively, the transducer 30 can include both a current carrying conductor and a magnet, while the rotor 18 is constructed from a ferrous material. Both the magnet and conductor of the transducer 30 are disposed closely adjacent the housing 12, such that the rotation of the rotor causes the rotor vanes to pass near the magnet and conductor and vary the magnetic field experienced by the conductor, resulting in the development of the output signal. Of course, the material from which the housing 12 is constructed should be selected so as not to interfere with the interaction of the rotor 18 and the transducer 30. In particular, the housing 12 should not act as a shield between the rotor 18 and the housing 12.
Most advantageously, the paddle wheel 20 includes a plurality of rectangular paddles 28 which are planar and radially equiangularly disposed about the axis of rotation of the rotor 18. Preferably, the paddles 28 are each coplanar with the axis of rotation of the rotor 18.
In the preferred embodiment of the present invention, the paddle wheel 20 is constructed from a plastic or resin which is substantially inert to the fluid passing through the housing 12. As shown in FIG. 2, the paddle wheel 20 comprises twelve symmetrically disposed paddles 28 although it should be apparent that more or fewer paddles would also work as well. An elongated and rectangular recess 33 is formed in one end 38 of each of an opposing pair 34 of the paddles 28. The recesses 33 extend about halfway through the pair of paddles 34, and each frictionally retains a permanent magnet 36 at an inner recess end 40. The magnets 36 are also preferably inert to the fluid passing through the housing 12, although the magnets 36 can alternatively be sealed and retained on the recesses 33 by an inert material. The magnets 36 are preferably oriented so as to maximize the magnetic field changes experienced by the Hall effect transducer 30, and are inserted into the recesses 33 a sufficient distance so that, when rotated, the paths of the magnets 36 are tangential to the center of the transducer 30.
While this is the preferred construction for the rotor 18, it should be appreciated that rotor constructions having a greater or lesser efficiency of reaction to fluid flow are also known. Preferably, the present invention includes a plurality of replaceable rotors 18 having different rotational efficiencies, such that they rotate with different speeds at the same rate of fluid flow. The substitution of one rotor for another in the housing 12 thereby changes the rate at which the magnetic field experienced by the conductor in the transducer 30 changes, thereby changing the range of fluid flow rates which can be measured by an apparatus 10.
The present invention is thus advantageous over the prior art indicators in several ways. The housing is imperforate to mechanical connection or linkage between the transducer and the rotor. The only sources of leakage during normal operation are the cover and the connections to the remainder of the fluid system, and these can generally be sealed to withstand significantly higher pressures than traditional shaft packings, so the leakage encountered in the earlier indicators is avoided. Additionally, the simple construction allows a rapid change of the flow rate range of the indicator, without requiring extensive repacking about the shaft which traditionally perforates the housing. Of course, the range of flow rates over which the detector is operational can also be changed by changing the transducer employed. Changing the rotor, however, is substantially quicker and free of trouble than is changing the transducer, since no electrical connections need to be broken or made.
Having described my invention, however, many modifications thereto will become apparent to those skilled in art to which it pertains, without deviation from the spirit of the present invention, as defined by the scope of the appended claims.

Claims (17)

I claim:
1. A fluid flow indicator comprising:
a housing having a housing portion defining a fluid passageway therethrough;
a rotor contained in said housing in a position so as to be rotated about an axis of rotation by fluid flowing through said passageway; and
a hall effect transducer, positioned outside said housing, and being responsive to the rotation of said rotor so a to produce an output signal corresponding to a condition of fluid flow through said passageway;
wherein said housing further comprises an imperforate detachable cover trappingly retaining said rotor between said imperforate cover and the remainder of said housing
wherein said indicator further comprises a plurality of interchangeable rotors, each rotor having different hydraulic characteristics one of said rotors being contained one at a time in said housing, such that the range of flow rates over which the indicator is operable is determined by the selection and placement of one of said plurality of rotors in said housing.
2. The invention according to claim 1, wherein said rotor is wholly contained in said housing.
3. The invention according to claim 1, wherein each said rotor is carried on an axle disposed in said housing, and each said rotor and said axle are wholly contained in said housing.
4. The invention according to claim 1, wherein each said rotor comprises a paddle wheel.
5. The invention according to claim 4, wherein each said paddle wheel is carried on an axle disposed in said housing.
6. The invention according to claim 5, wherein said axle is skew but perpendicular to the axis of said passageway.
7. The invention according to claim 6, wherein one end of each said paddle wheel is disposed in said passageway.
8. The invention according to claim 1, wherein each said rotor comprises a ferrous material.
9. The invention according to claim 1, wherein each said rotor comprises a magnetic material.
10. The invention according to claim 1, wherein each said rotor has an axis of rotation and comprises a plurality of radially equiangularly disposed planar vanes, each of said vanes being coplanar with said axis of rotation of its rotor.
11. The invention according to claim 10, wherein said vanes are rectangular.
12. The invention according to claim 1, wherein said housing is imperforate to mechanical connection between said rotor and said Hall effect transducer.
13. The invention according to claim 1, wherein each said rotor comprises a material nonreactive to the fluid whose flow said indicator measures.
14. The invention according to claim 1, wherein at least one of said rotors is made of a plastic material.
15. The invention according to claim 1, wherein said rotor comprises at least one permanent magnet.
16. The invention according to claim 1, wherein at least one of said rotors is made of a resin material.
17. The invention according to claim 1, wherein said imperforate cover is spaced from said passageway in the direction of said axis of rotation of said rotor.
US06/914,144 1986-10-01 1986-10-01 Fluid flow indicator including a hall effect transducer Expired - Fee Related US4825707A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US06/914,144 US4825707A (en) 1986-10-01 1986-10-01 Fluid flow indicator including a hall effect transducer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/914,144 US4825707A (en) 1986-10-01 1986-10-01 Fluid flow indicator including a hall effect transducer

Publications (1)

Publication Number Publication Date
US4825707A true US4825707A (en) 1989-05-02

Family

ID=25433970

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/914,144 Expired - Fee Related US4825707A (en) 1986-10-01 1986-10-01 Fluid flow indicator including a hall effect transducer

Country Status (1)

Country Link
US (1) US4825707A (en)

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5105767A (en) * 1989-01-03 1992-04-21 168189 Canada Limited Computerized monitoring system for animal feed ration processing mills
US5228473A (en) * 1990-10-09 1993-07-20 Montana Sulphur & Chemical Co. Internal safety valve system
US5228469A (en) * 1991-08-15 1993-07-20 Otten Bernard J Fluid control system
US5238022A (en) * 1990-10-09 1993-08-24 Montana Sulphur & Chemical Co. Internal rotary valve actuator system
US5280874A (en) * 1990-10-09 1994-01-25 Montana Sulphur & Chemical Co. Internal valve
DE29617294U1 (en) * 1996-10-04 1997-02-06 Buerkert Werke Gmbh & Co Flow sensor
WO1997016705A1 (en) * 1995-10-30 1997-05-09 Hans Jørgen Jensen, Pandrup A/S Detection system for a flowmeter
US5648606A (en) * 1995-07-05 1997-07-15 Dresser Industries Fluid meter having a crankshaft with two angularly spaced crank pins radially offset from the crankshaft
WO1998041819A1 (en) * 1997-03-19 1998-09-24 Autotrol Corporation Elbow mounted turbine flowmeter
US5868279A (en) * 1994-06-16 1999-02-09 Powell; Anthony Device for dispensing liquids in a desired ratio
US6250167B1 (en) 1998-08-31 2001-06-26 M & Fc Holding Company Removable radio frequency sensor assembly for a turbine flow meter
AT409302B (en) * 1999-03-23 2002-07-25 Vaillant Gmbh IMPELLER-FLOWMETERS
US6487919B1 (en) 2001-11-06 2002-12-03 Breed Automotive Technology, Inc. Turbine flow monitoring device
US6641562B1 (en) 2000-05-10 2003-11-04 Hps Medical, Inc. Apparatus and method of intravenous fluid infusion
US6789434B2 (en) * 2001-10-23 2004-09-14 Dwyer Instruments, Inc. Fluid flowmeter having a hall effect sensor with an internal magnet
US20050254960A1 (en) * 2004-05-12 2005-11-17 Owen Watkins Fuel delivery system and method providing regulated electrical output
AT502408B1 (en) * 2005-02-21 2007-03-15 Vaillant Gmbh WATER FLOW METER
EP2056075A2 (en) 2007-11-05 2009-05-06 Digmesa Ag Top for a flowmeter and flowmeter
US9113610B2 (en) 2010-12-04 2015-08-25 Pioneer Pet Products, Llc Water wheel aerator assembly for pet fountain
JP2016099325A (en) * 2014-11-26 2016-05-30 株式会社鷺宮製作所 Flow sensor
WO2021055819A1 (en) * 2019-09-19 2021-03-25 Innovative Health Sciences, Llc Infusion controller using inline feedback through integral flow measurement in tubing
RU224102U1 (en) * 2023-12-05 2024-03-18 Общество с ограниченной ответственностью "Газпром добыча Уренгой" VISUAL FLOW INDICATOR

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2906121A (en) * 1955-09-02 1959-09-29 Berthold A Knauth Flowmeter
US3636767A (en) * 1967-06-16 1972-01-25 Kent Ltd G Measurement of fluid flow
GB1386580A (en) * 1972-07-27 1975-03-12 Tokico Ltd Turbine-type flowmeter
JPS5544963A (en) * 1978-09-28 1980-03-29 Tsutomu Iikawa Flow meter
JPS5630614A (en) * 1979-08-23 1981-03-27 Derufuai:Kk Flowmeter
US4337655A (en) * 1976-09-09 1982-07-06 Sundstrom Inge B Valve provided with a measuring instrument and intended for a moving medium
US4461174A (en) * 1981-07-16 1984-07-24 Shinhan Kongki Co., Ltd. Vane wheel water meter
US4512201A (en) * 1982-12-22 1985-04-23 Wassermesserfabrik Andrae Gmbh & Co. Flow volumeter for liquids
US4534227A (en) * 1982-11-26 1985-08-13 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Device for measuring the flow of a fluid
US4565090A (en) * 1983-10-17 1986-01-21 Motohiro Gotanda Detection device for detecting and indicating operation of a gas meter

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2906121A (en) * 1955-09-02 1959-09-29 Berthold A Knauth Flowmeter
US3636767A (en) * 1967-06-16 1972-01-25 Kent Ltd G Measurement of fluid flow
GB1386580A (en) * 1972-07-27 1975-03-12 Tokico Ltd Turbine-type flowmeter
US4337655A (en) * 1976-09-09 1982-07-06 Sundstrom Inge B Valve provided with a measuring instrument and intended for a moving medium
JPS5544963A (en) * 1978-09-28 1980-03-29 Tsutomu Iikawa Flow meter
JPS5630614A (en) * 1979-08-23 1981-03-27 Derufuai:Kk Flowmeter
US4461174A (en) * 1981-07-16 1984-07-24 Shinhan Kongki Co., Ltd. Vane wheel water meter
US4534227A (en) * 1982-11-26 1985-08-13 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Device for measuring the flow of a fluid
US4512201A (en) * 1982-12-22 1985-04-23 Wassermesserfabrik Andrae Gmbh & Co. Flow volumeter for liquids
US4565090A (en) * 1983-10-17 1986-01-21 Motohiro Gotanda Detection device for detecting and indicating operation of a gas meter

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5105767A (en) * 1989-01-03 1992-04-21 168189 Canada Limited Computerized monitoring system for animal feed ration processing mills
US5228473A (en) * 1990-10-09 1993-07-20 Montana Sulphur & Chemical Co. Internal safety valve system
US5238022A (en) * 1990-10-09 1993-08-24 Montana Sulphur & Chemical Co. Internal rotary valve actuator system
US5280874A (en) * 1990-10-09 1994-01-25 Montana Sulphur & Chemical Co. Internal valve
US5285998A (en) * 1990-10-09 1994-02-15 Montana Sulphur & Chemical Co. Internal valve for pressure fluid containment vessels
US5228469A (en) * 1991-08-15 1993-07-20 Otten Bernard J Fluid control system
US6092693A (en) * 1994-06-16 2000-07-25 Powell; Anthony Device for dispensing liquids in a desired ratio
US5868279A (en) * 1994-06-16 1999-02-09 Powell; Anthony Device for dispensing liquids in a desired ratio
US5648606A (en) * 1995-07-05 1997-07-15 Dresser Industries Fluid meter having a crankshaft with two angularly spaced crank pins radially offset from the crankshaft
WO1997016705A1 (en) * 1995-10-30 1997-05-09 Hans Jørgen Jensen, Pandrup A/S Detection system for a flowmeter
DE29617294U1 (en) * 1996-10-04 1997-02-06 Buerkert Werke Gmbh & Co Flow sensor
US6481293B1 (en) 1997-03-19 2002-11-19 Osmonics, Inc. Elbow mounted turbine flowmeter
WO1998041819A1 (en) * 1997-03-19 1998-09-24 Autotrol Corporation Elbow mounted turbine flowmeter
US6250167B1 (en) 1998-08-31 2001-06-26 M & Fc Holding Company Removable radio frequency sensor assembly for a turbine flow meter
AT409302B (en) * 1999-03-23 2002-07-25 Vaillant Gmbh IMPELLER-FLOWMETERS
US6641562B1 (en) 2000-05-10 2003-11-04 Hps Medical, Inc. Apparatus and method of intravenous fluid infusion
US20040064097A1 (en) * 2000-05-10 2004-04-01 Peterson Dean Mccormack Apparatus and method of intravenous fluid infusion
US6789434B2 (en) * 2001-10-23 2004-09-14 Dwyer Instruments, Inc. Fluid flowmeter having a hall effect sensor with an internal magnet
US6487919B1 (en) 2001-11-06 2002-12-03 Breed Automotive Technology, Inc. Turbine flow monitoring device
US7327045B2 (en) * 2004-05-12 2008-02-05 Owen Watkins Fuel delivery system and method providing regulated electrical output
US20050254960A1 (en) * 2004-05-12 2005-11-17 Owen Watkins Fuel delivery system and method providing regulated electrical output
AT502408B1 (en) * 2005-02-21 2007-03-15 Vaillant Gmbh WATER FLOW METER
EP2056075A2 (en) 2007-11-05 2009-05-06 Digmesa Ag Top for a flowmeter and flowmeter
EP2056075A3 (en) * 2007-11-05 2010-01-06 Digmesa Ag Top for a flowmeter and flowmeter
US9113610B2 (en) 2010-12-04 2015-08-25 Pioneer Pet Products, Llc Water wheel aerator assembly for pet fountain
JP2016099325A (en) * 2014-11-26 2016-05-30 株式会社鷺宮製作所 Flow sensor
WO2021055819A1 (en) * 2019-09-19 2021-03-25 Innovative Health Sciences, Llc Infusion controller using inline feedback through integral flow measurement in tubing
RU224102U1 (en) * 2023-12-05 2024-03-18 Общество с ограниченной ответственностью "Газпром добыча Уренгой" VISUAL FLOW INDICATOR

Similar Documents

Publication Publication Date Title
US4825707A (en) Fluid flow indicator including a hall effect transducer
JP3712738B2 (en) Flowmeter
US4641522A (en) Bearing-less positive displacement flowmeter
US4489616A (en) Digital fluid flow meter
JPH04212066A (en) Rotary speed sensor
US3898883A (en) Stator assembly for flowmeters and the like
US3329021A (en) Fluid flow meter
US4023410A (en) Fluid flow meter
WO1996029574A3 (en) Coriolis effect mass flowmeter using concentric rotors
US3342070A (en) Fluid meter
KR840004263A (en) Rotation detector
CA2231544A1 (en) Coriolis effect mass flowmeter using a single rotor having a flexible sensing element
US2248030A (en) Motion transmitting mechanism
US3256737A (en) Velocity flowmeters
US3398577A (en) Magnetic coupling drive assembly for fluid flow meters
SE502952C2 (en) Volume meter for liquids and / or gases
CA2068379A1 (en) Magnetic drive system, and a meter, in particular a water meter, including such a system
US4574644A (en) Ball bearing flow meter and pump
JP3063809B2 (en) Volumetric flow meter
US3526133A (en) Magnetic coupling
SU1464000A1 (en) Combination seal
JP3282638B2 (en) Flowmeter
EP0802414A2 (en) Shaft seal and shaft sensor
US3552208A (en) Impeller-type flowmeter
JPH0543383Y2 (en)

Legal Events

Date Code Title Description
FPAY Fee payment

Year of fee payment: 4

REMI Maintenance fee reminder mailed
LAPS Lapse for failure to pay maintenance fees
FP Lapsed due to failure to pay maintenance fee

Effective date: 19970507

STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362